AOC LE20A1140 Schematic
19.5″LED TV AOC LE20A1140
Service
Service
Service
TABLE OF CONTENTS
Description Page Description Page
Table of Contents.......……....................................…........1
Important Safety Notice.......................................……......2
Revision List…………………………………………………3
1. General Specification..............................……...…........4
2. Operating Instructions………………...…….……….......5
2.1 The Use of Remote Control…….…..……….…….......5
2.2 To Use the Menus….....………………….…..…….......6
2.3 How to Connect……..……………….…….……….....11
2.4 Front Panel Control Knobs…….………….………....13
3. Input/ Output Specification………....................…....14
4. Mechanical Instructions…………………….................16
5. Repair Flow Chart ……………………….…….…….....19
6. PCB Layout ………………..………………....….......25
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
SAFETY NOTICE
6.1 Main Board……...…………..….…….……….......25
6.2 Power Board……...…………..….…….……….......27
6.3 IR Board…...…………………………………….......30
7. Adjustment..............................................................31
7.1 WB Adjustment……………………..……...………31
7.2 FW Upgrade.………………………………...………32
8. Block Diagram…..…………....………………...33
9. Schematic Diagram…..…………....………………...35
9.1 Main Board…………..….….……...………….......35
9.2 Power Board…………..….….……...………….......45
9.3 IR Board…...…………….……….…………….........47
10. Exploded View………………………………….…...48
11. BOM List……………….…..…………….………….50
AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
Copyright © 2014 by TPV Corporation. All rights reserved. Specifications are subject to change without notice.
No part of this publication may be reproduced in any form or means, without the prior written permission of TPV Corporation.
Otherwise we will reserve the right to investigate the legal responsibility.
1
Important Safety Notice
Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service
procedures recommended by AOC and described in this service manual are effective methods of performing service
operations. Some of these service operations require the use of tools specially designed for the purpose. The
special tools should be used when and as recommended.
It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in
order to minimize the risk of personal injury to service personnel. The possibility exists that improper service
methods may damage the equipment. It is also important to understand that these CAUTIONS and NOTICES ARE
NOT EXHAUSTIVE. AOC could not possibly know, evaluate and advise the service trade of all conceivable ways in
which service might be done or of the possible hazardous consequences of each way. Consequently, AOC has not
undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not
recommended by AOC must first satisfy himself thoroughly that neither his safety nor the safe operation of the
equipment will be jeopardized by the service method selected.
Hereafter throughout this manual, AOC Company will be referred to as AOC.
WARNING
Use of substitute replacement parts, which do not have the same, specified safety characteristics might create
shock, fire, or other hazards.
Under no circumstances should the original design be modified or altered without written permission from AOC.
AOC assumes no liability, express or implied, arising out of any unauthorized modification of design.
Servicer assumes all liability.
FOR PRODUCTS CONTAINING LASER:
DANGER-Invisible laser radiations when open AVOID DIRECT EXPOSURE TO BEAM.
CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may
result in hazardous radiation exposure.
CAUTION -The use of optical instruments with this product will increase eye hazard.
TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S
REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION OF
THIS SERVICE MANUAL.
Take care during handling the LCD module with backlight unit
-Must mount the module using mounting holes arranged in four corners.
-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen.
-Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to
the panel.
-Protect the module from the ESD as it may damage the electronic circuit (C-MOS).
-Make certain that treatment person’s body is grounded through wristband.
-Do not leave the module in high temperature and in areas of high humidity for a long time.
-Avoid contact with water as it may a short circuit within the module.
-If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may
damage the panel.)
2
Revision List
Version Release Date Revision Instructions Customer Model TPV Model
E20D41NSBTE7NN
A00 Feb.24,2014 Initial release LE20A1140
E20D41NSBTE6NN
3
1. General Specification
4
2. Operating Instructions
2.1 The Use of Remote Control
5
2.2 To Use the Menus
6
7 8 9
10
2.3 How to Connect
11
12
2.4 Front Panel Control Knobs
13
3. Input / Output Specification
D-Sub and HDMI Pin assignment
D-Sub (CN101) HDMI1 (CN501) HDMI2(CN506)
PIN
No.
1 Red 1 TMDS Data2+ 1 TMDS Data2+
2 Green 2 TMDS Data2 shield 2 TMDS Data2 shield
3 Blue 3 TDMS Data2- 3 TDMS Data24 D/TXDC 4 TMDS Data1+ 4 TMDS Data1+
5 GND 5 TMDS Data1 shield 5 TMDS Data1 shield
6 Red GND 6 TMDS Data1- 6 TMDS Data17 Green GND 7 TMDS Data0+ 7 TMDS Data0+
8 Blue GND 8 TMDS Data0 shield 8 TMDS Data0 shield
9 +5V (supply from PC) 9 TMDS Data0- 9 TMDS Data010 Sync GND 10 TMDS Clock+ 10 TMDS Clock+
11 D/RXDC 11 TMDS Clock Shield 11 TMDS Clock Shield
12 Bi-directional data (SDA) 12 TMDS Clock- 12 TMDS Clock13 H-sync 13 CEC 13 CEC
14 V-sync (vclk) 14 ARC 14 NC
15 Data clock (SCL) 15 SCL 15 SCL
16 SDA 16 SDA
17 DDC_Ground 17 DDC_Ground
18 +5V Power 18 +5V Power
19 Hot Plug Detect 19 Hot Plug Detect
20 SHLD_GND1
21 SHLD_GND2
Signal PIN
No.
Signal PIN
Signal
No.
14
15
4. Mechanical Instructions
1. Remove the screws to remove STAND & BASE.
2. Remove the screws to remove REAR COVER.
16
3. Disconnect the PINS marked in yellow .Remove the screws marked in red to remove MAIN BOARD, POWER
BOARD and SPEAKERS.
4. Remove the screws to remove DECO and disconnect the pin to remove the IR Board.
17
Remove the screws to remove BKT.
5.
6. Panel.
18
p
p
5. Repair Flow Chart
1. No power
No power (LED “Off”)
Check the AC input and
the
ower is “ON”?
Yes
Power board
out
ut=5.2V?
Yes
Check the IR board and LED
Replace the IR board
No
Replace the main board
No
Power “On”
No
Replace the power board
19
2. Can’t start
Can’t start (LED Blue)
Power board output＝16V?
Yes
Check the power key is under control?
No
Check the IR receiver is normal?
No
Replace the power board
Yes
Replace the main board
Yes
Replace the IR board
No
Replace the main board
No
Replace the Power board
20
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